minh ko biet ve hinh nen noi hoi kho'.trong mat phang toa do Oxy cho tam giac ABC bit ba chan duong cao ung voi cac dinh ABC lan luot la MNK lan luot laM(1;1)N(-2;3)K(2;4) viet phuong trinh chua canh BC
ban noi' cac chan duong cao lai.sau do chung minh' AM la tia phan giac cua widehat{KMN} .
sau do viet phuong trinh duong phan giac AM thong qua hai phuong trinh duong duong thang KM va NM da biet toa do.
khi do'vecto chi phuong cua? AM chinh' la vecto phap' tuyen' cua? duong thang BC lai biet toa do cua M thuoc BC.nhu vay la ta se viet duoc phuong trinh duong thang BC